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05-28-2018, 05:42 PM | #1 |
Junior Member
Join Date: Feb 2014
Posts: 28
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model b oil pressure
why does model b engine lose oil pressure when turning corner?normal driving ahead holds 3 to 5 #
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05-28-2018, 05:57 PM | #2 |
Senior Member
Join Date: May 2010
Location: new britain,ct 06052
Posts: 9,389
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Re: model b oil pressure
How much oil is in the pan??
Paul in CT |
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05-28-2018, 06:08 PM | #3 |
Junior Member
Join Date: Feb 2014
Posts: 28
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Re: model b oil pressure
its up the full mark on oil stick, ronny
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05-28-2018, 11:56 PM | #4 |
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Join Date: May 2010
Location: NorCal
Posts: 2,617
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Re: model b oil pressure
No pan baffles around pump
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05-29-2018, 02:41 PM | #5 |
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Join Date: May 2010
Location: Southern California
Posts: 7,017
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Re: model b oil pressure
Previous comments plus. Can we assume the engine sits in the same position as the Model A engine did and not on an angle? Does it happen on both left and right turns? Did you happen to notice how much oil you added to get to the full mark? If I remember correctly it is 4 quarts or almost 5 if the dipper trays are empty. Are you sure you have the correct dip stick? The dip sticks were the same 1928-34 for the 4 cylinder engines but do you know what you have? Good luck.
Charlie Stephens |
05-29-2018, 07:45 PM | #6 |
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Join Date: Feb 2014
Posts: 28
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Re: model b oil pressure
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05-29-2018, 08:32 PM | #7 |
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Join Date: May 2010
Location: southeastern Michigan
Posts: 10,069
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Re: model b oil pressure
If you don't have the undercut shaft in the pump as original (unlike at least some of the Model A pump shafts) you are not getting the pump volume that was intended. Also, are you positive that you don't have the triangular semi-cone-shaped baffle that fits over the top of the pump before it is installed in the cylinder block?
It strikes me that your oil pressure is too low in general, apart from braking or turning. The engine in my avatar produces 7-8 psi at slow idle and 12-14 psi at any kind of speed, including fast idle. Last edited by DavidG; 05-29-2018 at 08:46 PM. Reason: additional information |
05-30-2018, 07:26 AM | #8 |
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Join Date: Feb 2014
Posts: 28
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Re: model b oil pressure
i do know the shaft is under cut in the oil pump.my pressure is steady while driving but i will pay closer attention to numbers.i do know i dont have a baffle around oil pump.i just know while braking hard oil pressure drops to 0 to i/2 pounds.can it be acc. no baffle?
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05-30-2018, 09:39 AM | #9 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,371
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Re: model b oil pressure
It needs the cover over the screen to be secure and that butterfly wing plate P/N B-6631 to help control oil flow and pick up. The spring on the bottom that holds the pump may have some fatigue but as long as the pump is working it should be OK. Wear on the gears, gear plate, or body can lower the pressure.
These old engines don't need a lot of oil pressure since it's mostly just feeding oil for gravity flow unless this engine has been modified but it's nice to know that there is some flow going on. B engines had pressure on mains but they had better bearings too. When they are worn they will talk to you. Last edited by rotorwrench; 05-30-2018 at 10:15 AM. |
05-30-2018, 02:35 PM | #10 |
Junior Member
Join Date: Feb 2014
Posts: 28
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Re: model b oil pressure
for safety sake i'll replace the oil pump(which was a used one)with one with the proper cover around it.thanks for you help
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05-30-2018, 03:13 PM | #11 |
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Join Date: May 2010
Location: Solihull, England.
Posts: 8,732
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Re: model b oil pressure
I have experienced low oil pressure on a V8 and found my dipstick was mismatched. I had to fill from scratch and re-mark the dipstick. The new marks were about 3/4" above the old. Just mentioning it in case your parts are giving an artificially low level although reading ok.
Mart. |
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